If you’ve suddenly lost water pressure at one tap or your shower has started spluttering for no obvious reason, there’s a fair chance you’re dealing with an airlock in water pipes. It sounds like something complicated, but in many cases, it isn’t. The tricky part is figuring out whether it really is an airlock or something else pretending to be one.
I remember hearing someone describe it as “the pipes have trapped a bubble they can’t get rid of.” That’s not a bad way of thinking about it, actually.
If you’re wondering how to remove an airlock from water pipes, the good news is that some airlocks can be cleared without major plumbing work. Others… well, they need a bit more help.
Let’s go through what causes them, how to spot one, and what you can safely try before calling a plumber.
What Is an Airlock in Water Pipes?
An airlock happens when air becomes trapped inside your plumbing system and prevents water from flowing properly.
Instead of a smooth stream of water moving through the pipes, the trapped air creates a blockage. Think of it as a traffic jam inside the plumbing.
The result?
Water may stop flowing altogether or come out in short bursts mixed with air.
An airlock in water pipes is more common in older plumbing systems, particularly after:
- Plumbing repairs
- Boiler installation
- Draining the heating system
- Replacing taps
- Water supply interruptions
It’s frustrating because everything may have been working perfectly the day before.
Then suddenly… nothing.
Signs of an Airlock in Water Pipes
An airlock doesn’t always announce itself clearly.
Sometimes the symptoms resemble other plumbing faults.
Still, there are a few warning signs that appear quite often.
Water Stops Flowing From One Tap
If one tap suddenly stops working while others remain completely normal, trapped air may be preventing water from reaching that fixture.
Spluttering Water
One of the most obvious signs is water mixed with bursts of air.
The tap spits.
Water surges.
Then nothing.
Then another burst.
It’s usually pretty noticeable.
Low Water Pressure
A pipe air lock can significantly reduce water pressure.
Instead of a steady flow, you might only get a weak trickle.
Noisy Pipes
Air moving through plumbing can create:
- Gurgling sounds
- Banging noises
- Vibrations
- Whistling
Not every noisy pipe indicates an airlock.
But combined with poor water flow, it becomes much more likely.
What Causes Air in Water Pipes?
Several situations can introduce air in water pipes.
Some are completely normal.
Others point to underlying plumbing issues.
Common causes include:
Plumbing Repairs
Whenever pipework is disconnected, air enters the system.
Usually it works its way out naturally.
Sometimes it doesn’t.
Water Supply Interruptions
If your local water supplier temporarily shuts off supply, air may enter the system when service resumes.
Boiler Maintenance
Heating engineers often drain sections of plumbing during maintenance.
This can occasionally leave trapped air behind.
Faulty Plumbing Components
In some cases, worn valves or poor plumbing design make air blocking more likely.
Repeated airlocks should always be investigated.
How to Remove an Airlock From Water Pipes
If you’re comfortable with basic household maintenance, there are a few methods you can try.
Method 1: Run All Cold Water Taps
This is the easiest approach.
Turn on every cold tap in your property.
Leave them running for several minutes.
Sometimes the increased water movement pushes trapped air through the system naturally.
It’s surprisingly effective.
And costs nothing.
Method 2: Force Water Through the Blocked Pipe
If only one tap is affected, another method involves forcing mains water backwards through the blocked pipe.
This is often done using:
- A short hosepipe
- Two tap connectors
- Cold mains pressure
The process briefly connects a working tap to the affected tap, allowing higher-pressure water to push the trapped air out.
It sounds unusual.
Because it is.
But plumbers have used this technique for years.
If you’re unsure how to do it safely, it’s best to avoid experimenting.
Method 3: Check Hot Water Separately
If only the hot tap is affected, the airlock may exist within the hot water supply rather than the cold water pipes.
Running hot taps throughout the property sometimes clears smaller air pockets.
Patience helps here.
Occasionally it takes a few minutes.
Method 4: Restart the Water Supply
If the airlock appeared after plumbing work, shutting off the main water supply briefly before reopening it slowly can sometimes help rebalance pressure throughout the system.
There’s no guarantee.
But it’s another simple option worth trying.
When DIY Doesn’t Work
Not every water pipes airlock can be cleared at home.
Some situations require professional equipment or investigation.
You should contact a plumber if:
- No water flows after several attempts
- Multiple fixtures are affected
- Airlocks keep returning
- Pipework is making loud banging noises
- The problem appeared after major plumbing work
Repeated airlocks often indicate another issue hiding underneath.
And that’s the part worth investigating.
Could It Be Something Else?
This is actually quite common.
People assume they have an airlock when the real problem is something completely different.
Possible alternatives include:
Blocked Pipes
Mineral deposits or debris can restrict water flow.
Faulty Stopcock
A partially closed stop valve can mimic an airlock.
Pressure Problems
Low mains pressure affects multiple taps rather than one isolated fixture.
Faulty Pump
Homes with boosted water systems may experience pump-related pressure issues.
A professional plumber can usually identify the cause fairly quickly.
Sometimes it’s an airlock pipe repair.
Sometimes it isn’t.
Can Airlocks Damage Pipes?
Generally speaking, airlocks themselves don’t usually damage plumbing.
The bigger concern is ignoring the reason they occurred.
For example:
- Repeated air entering the system
- Faulty valves
- Hidden leaks
- Pressure imbalance
These underlying issues can eventually cause more significant plumbing problems.
So while the airlock may be harmless, the cause isn’t always.
How to Prevent Future Airlocks
You can’t prevent every airlock.
But you can reduce the chances.
Some useful habits include:
- Have plumbing work carried out professionally.
- Bleed systems correctly after maintenance.
- Check for hidden leaks.
- Maintain boilers regularly.
- Avoid unnecessary draining of pipework.
Simple maintenance often prevents bigger headaches later.
Professional Airlock Pipe Repair in London
If you’ve tried clearing the airlock and water still isn’t flowing properly, it’s probably time to bring in an expert.
Persistent air in water pipes can point to pressure issues, faulty valves, hidden plumbing defects, or more complex system faults that need professional diagnosis.
For homeowners across London, Plumr is one of the best choices for diagnosing and resolving airlock pipe repair issues. Whether you’re dealing with air blocking, low water pressure, or recurring water pipes airlock problems, their experienced plumbers can identify the real cause and restore proper water flow safely.
Sometimes the fix takes ten minutes.
Sometimes it uncovers something that would’ve become much more expensive if left another month.
Either way, it’s usually better to know.
FAQs
1. What causes an airlock in water pipes?
Airlocks usually occur after plumbing repairs, boiler maintenance, water supply interruptions, or when air becomes trapped inside the pipework.
2. Can I remove an airlock from water pipes myself?
Yes. In many cases, running all taps or using mains pressure to force water through the affected pipe can clear a minor airlock. More stubborn cases may require a plumber.
3. How do I know if I have an airlock or a blockage?
Airlocks often cause spluttering water, bursts of air, or complete loss of flow at one outlet. Blockages usually reduce flow gradually rather than suddenly.
4. Can an airlock damage my plumbing?
The trapped air itself usually doesn’t cause damage, but repeated airlocks may indicate underlying plumbing or pressure problems that should be professionally inspected.
